Use interception-tools for mapping keys

1 files changed, 46 insertions, 0 deletions

diff --git a/intcp-mapper.nix b/intcp-mapper.nix
new file mode 100644
index 0000000..5863f85
--- /dev/null
+++ b/intcp-mapper.nix
@@ -0,0 +1,46 @@
+{ lib, stdenv, writeText, mappings ? [] }:
+
+stdenv.mkDerivation rec {
+    name = "intcp-mapper";
+
+    src = writeText "intcp-mapper.c" ''
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/input.h>
+
+int main(void) {
+    setbuf(stdin, NULL), setbuf(stdout, NULL);
+
+    struct input_event event;
+    while (fread(&event, sizeof(event), 1, stdin) == 1) {
+        /* Example
+        if (event.type == EV_KEY && event.code == KEY_X) {
+            event.code = KEY_Y;
+        }
+        */
+
+        if (event.type == EV_KEY) {
+            ${ lib.concatStrings (map (m: ''
+                if (event.code == ${m.from}) {
+                    event.code = ${m.to};
+                }
+            '') mappings) }
+        }
+
+        fwrite(&event, sizeof(event), 1, stdout);
+    };
+}
+    '';
+
+    dontUnpack = true;
+
+    buildPhase = ''
+        cat $src
+        gcc $src -o mapper
+    '';
+
+    installPhase = ''
+        mkdir -p $out/bin
+        install -m 555 mapper $out/bin/mapper
+    '';
+}